package cn.itcast.consumer.web;

import cn.itcast.consumer.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.List;

@RestController
@RequestMapping("consumer")
public class ConsumerController {

    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    private DiscoveryClient discoveryClient;

    @GetMapping("{id}")
    public User queryById(@PathVariable("id") Long id){
        //拉取服务
        List<ServiceInstance> instances = discoveryClient.getInstances("user-service");
        //利用负载均衡算法，从集合中取出一个用
        ServiceInstance instance = instances.get(0);
        String host = instance.getHost();
        int port = instance.getPort();
        String url=String.format("http://%s:%d/user/%d",host,port,id);
        User user = restTemplate.getForObject(url,User.class);
        return user;
    }
}
